This article gives step-by-step instructions on how to find your PC's MAC address. This process is the same for all versions of Windows Operating Systems.
Open the Command Prompt
Click the START button, and type "cmd" (without quotes) into the search bar, then hit ENTER. Type the IPConfig Command Once the Command Prompt has opened, type "ipconfig /all" (without quotes) and hit ENTER. **Please note the space in the middle, before "/all" **
Find your Physical adapter
Scroll down to the section title "Ethernet adapter Local Area Connection. The Physical Address, or MAC address, is what you're looking for. It is 12 sets of numbers/letters separated by dashes (ex. 01-23-45-ab-cd-1a)